| Source Element | Destination Element | Flow |
|---|
| Arterial Roadside Equipment | Arterial Traffic Control Systems | barrier system status |
| Express Lane Field Equipment | Arterial Traffic Control Systems | barrier system status |
| Vehicles | vehicle payment request |
| Vehicles | vehicle payment update |
| Port DMS | Arterial Traffic Control Systems | barrier system status |
| Railroad Crossing Monitoring System | Arterial Traffic Control Systems | barrier system status |
| SCRRA Wayside Signal System | Arterial Traffic Control Systems | barrier system status |
| Vehicles | Express Lane Field Equipment | vehicle payment information |